This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 19 |
| 6 | 43 |
| 7 | 103 |
| 8 | 239 |
| 9 | 569 |
| 10 | 1339 |
| 11 | 3185 |
| 12 | 7503 |
| 13 | 17794 |
| 14 | 41908 |
| 15 | 99137 |
| 16 | 233251 |
| 17 | 550624 |
| 18 | 1294032 |
| 19 | 3049412 |
| 20 | 7158698 |
| 21 | 16844717 |
| 22 | 39505579 |
| 23 | 92841149 |